766439138 has 32 divisors (see below), whose sum is σ = 1245119040. Its totient is φ = 352658880.

The previous prime is 766439131. The next prime is 766439159. The reversal of 766439138 is 831934667.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 766439092 and 766439101.

It is not an unprimeable number, because it can be changed into a prime (766439131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320708 + ... + 323088.

It is an arithmetic number, because the mean of its divisors is an integer number (38909970).

Almost surely, 2^766439138 is an apocalyptic number.

766439138 is a deficient number, since it is larger than the sum of its proper divisors (478679902).

766439138 is a wasteful number, since it uses less digits than its factorization.

766439138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642.

The product of its digits is 653184, while the sum is 47.

The square root of 766439138 is about 27684.6372199456. The cubic root of 766439138 is about 915.1505771081.

The spelling of 766439138 in words is "seven hundred sixty-six million, four hundred thirty-nine thousand, one hundred thirty-eight".